You'd better to read yahoo website optimization manuals.
In 2 words:
1. Browser allows only 2 parallel connections to each domain, and 8 total.
2. If you do mirrors for your images, it can download up to 8 images simultaniously
3. It's better to keep mirrors on separate domain, without cookies, to speed up requests
That can make some sence, ONLY if you have tons of thumbnails on each single page.
I did this feature for fun, and didn't meashured effect yet. Anyway, it's not as significant, as (direct links + proper cache headers for static files).
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Ps. how do i know if i have a NGINX websever lol sorry :x
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If you ask such question, then 99% you don't have nginx